Webster's English Dictionary

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titmouse

tit.mouse \'tit-.mau.s\ \-.mi-s\ n or tit.mice [ME titmose fr. (assumed) ME 
   tit any small object or creature + ME] pl mose titmouse, fr. OE ma-se; akin 
   to OHG meisa titmouse : any of numerous small arboreal and insectivorous 
   passerine birds (family  Paridae and esp. genus Parus) related to the 
   nuthatches but longer tailed